Applied Catalysis A: General最新文献_第7页

Incorporation of the GRG-optimization method in the design and simulation of solar falling-film slurry photocatalytic reactors operated under turbulent regime 将grg优化方法应用于湍流状态下太阳能落膜浆状光催化反应器的设计与模拟

IF 4.8 2区化学

Applied Catalysis A: General Pub Date : 2025-09-11 DOI: 10.1016/j.apcata.2025.120562

Deyler Castilla-Caballero , Valentina Martínez-Castro , José Colina-Márquez , Fiderman Machuca-Martínez , Astrid Medina-Guerrero

{"title":"Incorporation of the GRG-optimization method in the design and simulation of solar falling-film slurry photocatalytic reactors operated under turbulent regime","authors":"Deyler Castilla-Caballero , Valentina Martínez-Castro , José Colina-Márquez , Fiderman Machuca-Martínez , Astrid Medina-Guerrero","doi":"10.1016/j.apcata.2025.120562","DOIUrl":"10.1016/j.apcata.2025.120562","url":null,"abstract":"<div><div>Photocatalytic reactor modeling has always been a complex duty involving several phenomena that must be described with powerful and accurate mathematical tools. Most efforts have been focused on simulating systems under controlled conditions and simplifying some models to obtain practical but reliable solutions. In this study, a falling-film solar pilot-scale photoreactor operated in turbulent regime is modeled for phenol degradation using the Generalized Reduced Gradient (GRG) method embedded in the MS Excel® environment. A Visual Basic code was developed to integrate this function with the equations corresponding to the transport phenomena, photons' emission and absorption models, mass balance, and kinetic expressions. The simulations were carried out considering different catalyst loads and radiation intensities, obtaining results with satisfactory agreement with experimental data of a TiO<sub>2</sub>-based slurry falling-film photoreactor operating with solar radiation and under a turbulent regime (R<sup>2</sup>=0.84 – 0.99). The model fitting improved with the empirical adjustment of the LVRPA exponent, exhibiting the strong dependence of this parameter on the radiation intensity. These results demonstrated that reliable simulations can be carried out by adapting different tools of low-cost software, like MS Excel®, for potential full-scale applications of a falling-film solar photoreactor.</div></div>","PeriodicalId":243,"journal":{"name":"Applied Catalysis A: General","volume":"708 ","pages":"Article 120562"},"PeriodicalIF":4.8,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145046355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Highly dispersed Pd-Ru bimetallic nanoparticles immobilized on N‑doped micro-mesoporous carbon for efficient catalytic hydrogenation of pyridine under mild conditions N掺杂微介孔碳上高分散的Pd-Ru双金属纳米颗粒在温和条件下用于吡啶的高效催化加氢

IF 4.8 2区化学

Applied Catalysis A: General Pub Date : 2025-09-11 DOI: 10.1016/j.apcata.2025.120552

Jianfeng Wang, Jintian Ren, Zhen Xu, Qiang Wei, Fan Yang

{"title":"Highly dispersed Pd-Ru bimetallic nanoparticles immobilized on N‑doped micro-mesoporous carbon for efficient catalytic hydrogenation of pyridine under mild conditions","authors":"Jianfeng Wang, Jintian Ren, Zhen Xu, Qiang Wei, Fan Yang","doi":"10.1016/j.apcata.2025.120552","DOIUrl":"10.1016/j.apcata.2025.120552","url":null,"abstract":"<div><div>The synergistic effects in bimetallic catalysts drive significant interest for hydrogenation catalysis. In this work, a series of Pd-Ru bimetallic catalysts supported on N-doped porous carbon were synthesized, with the optimized Ru₁Pd₁/NPC-1 exhibiting outstanding pyridine hydrogenation performance. Quantitative conversion was achieved under mild reaction (room temperature, H<sub>2</sub> balloon pressure), accompanied by remarkable substrate adaptability and recyclability. The introduced N species and hierarchical porous structure in the NPC carrier synergistically facilitate the dispersion and stabilization of metal nanoparticles, thereby forming highly dispersed metallic clusters with exceptional structural robustness. Furthermore, the formation of a Pd-Ru bimetallic alloy establishes novel active centers that strengthen reactant adsorption and activation, ultimately leading to superior catalytic activity. Density functional theory (DFT) calculations corroborate that the bimetallic system exhibits optimized adsorption energy and accelerated piperidine desorption efficiency. These results establish a foundation for designing stable and efficient metallic catalysts enabling sustainable pyridine conversion.</div></div>","PeriodicalId":243,"journal":{"name":"Applied Catalysis A: General","volume":"708 ","pages":"Article 120552"},"PeriodicalIF":4.8,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145096808","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Rapid and sustainable synthesis of iron(III) oxide nanoparticles with photocatalytic properties using microwave heating 微波加热快速可持续合成具有光催化性能的氧化铁纳米颗粒

IF 4.8 2区化学

Applied Catalysis A: General Pub Date : 2025-09-10 DOI: 10.1016/j.apcata.2025.120551

Carine Pereira da Silva , Marluce Oliveira da Guarda Souza , Noemi Raquel Checca Huaman , Igor Rodrigues Neves , Soraia Teixeira Brandão

{"title":"Rapid and sustainable synthesis of iron(III) oxide nanoparticles with photocatalytic properties using microwave heating","authors":"Carine Pereira da Silva , Marluce Oliveira da Guarda Souza , Noemi Raquel Checca Huaman , Igor Rodrigues Neves , Soraia Teixeira Brandão","doi":"10.1016/j.apcata.2025.120551","DOIUrl":"10.1016/j.apcata.2025.120551","url":null,"abstract":"<div><div>This work aimed to obtain iron oxide nanoparticles for use in heterogeneous photocatalysis through a fast, sustainable, and relatively unexplored route in photocatalyst production. A microwave-assisted heating synthesis method was employed to produce iron oxides on a nanometric scale given its shorter reaction time and lower reagent consumption compared to other methods. The iron(III) nitrate salt was heated in a microwave muffle furnace at temperatures 200–500 °C for 10 min. Iron(III) oxides (Fe<sub>2</sub>O<sub>3</sub>) were obtained, amorphous at 200 and 300 °C (particle size 95 and 71 nm, respectively) and crystalline with rhombohedral structure at 400 and 500 °C (particle size 47 and 42 nm, respectively) with band gap values between 1.87 and 2.01 eV, showing strong absorption in the ultraviolet and visible spectral regions. The most promising samples were obtained at 200 (IOM200) and 300 °C (IOM300), with larger specific areas (76 and 126 m<sup>2</sup> g<sup>−1</sup>), where the percentage of photocatalytic discoloration was 97 % and 89 % for methyl orange (MO) and 98 and 97 % for methylene blue (MB), respectively. For samples IOM200 and IOM300 the discoloration of the MO was due to the adsorption process combined with heterogeneous photocatalysis. The second-order kinetic model fitted well to experimental data for the MO, whereas for the MB the pseudo-first-order kinetic model best fitted the experimental data. In addition, the iron(III) oxides nanoparticles were also reusable in at least three cycling runs, showing good recycling stability, meeting the principles of green chemistry and sustainable environmental objectives.</div></div>","PeriodicalId":243,"journal":{"name":"Applied Catalysis A: General","volume":"708 ","pages":"Article 120551"},"PeriodicalIF":4.8,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145096812","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Cascade catalytic strategy based on Fe/Pd bimetallic tandem active sites for efficient removal of acetylene and ethylene impurities from high-purity hydrogen chloride gas 基于Fe/Pd双金属串联活性位点的级联催化策略高效去除高纯氯化氢气体中乙炔和乙烯杂质

IF 4.8 2区化学

Applied Catalysis A: General Pub Date : 2025-09-10 DOI: 10.1016/j.apcata.2025.120550

Kaihao Li, Yongwang Li, Yang Qin, Zheng Wang, Bingxin Zhu, Yancong Yin, Fumin Wang, Xubin Zhang

{"title":"Cascade catalytic strategy based on Fe/Pd bimetallic tandem active sites for efficient removal of acetylene and ethylene impurities from high-purity hydrogen chloride gas","authors":"Kaihao Li, Yongwang Li, Yang Qin, Zheng Wang, Bingxin Zhu, Yancong Yin, Fumin Wang, Xubin Zhang","doi":"10.1016/j.apcata.2025.120550","DOIUrl":"10.1016/j.apcata.2025.120550","url":null,"abstract":"<div><div>The production of high-purity hydrogen chloride from petrochemical by-product hydrogen chloride gas represents the primary industrial approach for manufacturing electronic-grade hydrogen chloride. However, trace acetylene and ethylene impurities in the feedstock severely compromise product quality. This study innovatively proposes a \"stepwise conversion-deep chlorination\" synergistic mechanism and successfully develops a bimetallic catalyst (10 %Fe/0.5 %Pd/AC). By tailoring the preparation processes, we precisely controlled the distribution of Fe and Pd active sites, while systematically comparing the performance between Single-metal tandem catalytic system (Pd/AC + Fe/AC) and the bimetallic catalyst. Experimental results combined with DFT calculations demonstrate the superior performance of the 10 %Fe/0.5 %Pd/AC catalyst and confirm the cascade reaction mechanism based on the synergistic tandem effect of Fe/Pd active sites: Acetylene preferentially undergoes hydrochlorination at Pd sites to form vinyl chloride, while ethylene and the resultant vinyl chloride are subsequently converted to chloroethane and more easily removable 1,1-dichloroethane at Fe sites. Under optimized conditions (120 °C, GHSV=180 h<sup>−1</sup>), removal efficiencies exceeding 99 % for both acetylene and ethylene were achieved, with 1,1-dichloroethane selectivity surpassing 99 %. Comprehensive characterizations demonstrated the outstanding stability of the 10 %Fe/0.5 %Pd/AC catalyst. This study presents an innovative catalytic approach for high-efficiency purification of industrial hydrogen chloride.</div></div>","PeriodicalId":243,"journal":{"name":"Applied Catalysis A: General","volume":"708 ","pages":"Article 120550"},"PeriodicalIF":4.8,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145046354","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Syngas to sustainable aviation fuel: Emerging catalysts and routes 合成气到可持续航空燃料：新兴催化剂和路线

IF 4.8 2区化学

Applied Catalysis A: General Pub Date : 2025-09-09 DOI: 10.1016/j.apcata.2025.120554

Evert Boymans , Yadolah Ganjkhanlou , Iker Agirrezabal-Telleria , Nerea Viar , Berend Vreugdenhil

{"title":"Syngas to sustainable aviation fuel: Emerging catalysts and routes","authors":"Evert Boymans , Yadolah Ganjkhanlou , Iker Agirrezabal-Telleria , Nerea Viar , Berend Vreugdenhil","doi":"10.1016/j.apcata.2025.120554","DOIUrl":"10.1016/j.apcata.2025.120554","url":null,"abstract":"<div><div>As the aviation sector needs to decarbonize, sustainable aviation fuel produced from syngas offers a promising pathway to decrease CO₂ emissions. A wide range of carbon sources including biomass, CO₂, and municipal and plastic waste can be used as sustainable feedstock to produce syngas. This review provides a comprehensive overview of all known routes for converting syngas into jet-range hydrocarbons, with particular emphasis on emerging catalytic approaches at low technology readiness levels. These include direct syngas-to-jet fuel range hydrocarbons (HCs) and syngas-to-olefins-to-jet fuel range HCs as well as routes with methanol- or ethanol as intermediate. We assess recent advances in catalyst design, such as bifunctional, core–shell, and tandem systems, and discuss how these compare to established pathways like Fischer–Tropsch synthesis, which is already certified under ASTM D7566. By benchmarking emerging technologies against ASTM-certified and near-commercial processes, this review identifies key opportunities and technical challenges that must be addressed to accelerate the deployment of syngas-based SAF solutions.</div></div>","PeriodicalId":243,"journal":{"name":"Applied Catalysis A: General","volume":"708 ","pages":"Article 120554"},"PeriodicalIF":4.8,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145096809","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Recent developments in the field of MOF-based catalytic systems: A review mof基催化体系研究进展综述

IF 4.8 2区化学

Applied Catalysis A: General Pub Date : 2025-09-09 DOI: 10.1016/j.apcata.2025.120555

Nur-Sultan Mussa , Kainaubek Toshtay , Franck Dumeignil

引用次数: 0

Fe-mediated enhancement of phenol selectivity in syringol hydrodeoxygenation over an in-situ-activated CoFeAg/SiO2 catalyst fe介导的原位活化CoFeAg/SiO2催化剂对丁香酚加氢脱氧中苯酚选择性的增强

IF 4.8 2区化学

Applied Catalysis A: General Pub Date : 2025-09-08 DOI: 10.1016/j.apcata.2025.120553

Hongying Sha , Yuxuan Feng , Jingbo Mao , Hui Lv , Jinxia Zhou

{"title":"Fe-mediated enhancement of phenol selectivity in syringol hydrodeoxygenation over an in-situ-activated CoFeAg/SiO2 catalyst","authors":"Hongying Sha , Yuxuan Feng , Jingbo Mao , Hui Lv , Jinxia Zhou","doi":"10.1016/j.apcata.2025.120553","DOIUrl":"10.1016/j.apcata.2025.120553","url":null,"abstract":"<div><div>The hydrodeoxygenation of lignin-derived syringol to phenol faces challenges in selectively cleaving C<sub>Aryl</sub>–O bonds while maintaining aromatic ring and a phenolic -OH group integrity. Herein, we developed a trimetallic CoFeAg/SiO<sub>2</sub> catalyst that achieves 100 % syringol conversion and 52.4 % phenol selectivity, surpassing bimetallic CoAg/SiO<sub>2</sub> (42.2 mol%) and monometallic Co/SiO<sub>2</sub> (7.6 mol%) catalysts. As promoters, Ag facilitates the low-temperature reduction of Co<sub>3</sub>O<sub>4</sub> to CoO and further to metallic Co, while Fe prevents excessive reduction of CoO to metallic Co. Through the synergistic effects of Fe and Ag on Co, the CoFeAg/SiO<sub>2</sub> catalyst undergoes in situ reduction under reaction conditions (1 MPa H<sub>2</sub>, 330 °C), forming a polycrystalline CoO-Co structure with abundant oxygen vacancy (O<sub>ᴠ</sub>) and Lewis acid sites. The CoO-Co-O<sub>v</sub> active sites facilitate heterolytic H<sub>2</sub> cleavage while preferentially adsorbing and activating oxygen-containing functional groups over the aromatic ring of syringol. This dual functionality selectively promotes C<sub>Aryl</sub>–O bond dissociation while suppressing undesired ring hydrogenation, providing an effective catalyst design strategy for sustainable phenol production from biomass-derived syringol.</div></div>","PeriodicalId":243,"journal":{"name":"Applied Catalysis A: General","volume":"708 ","pages":"Article 120553"},"PeriodicalIF":4.8,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145020045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Low temperature polyolefin deconstruction via tandem cracking-hydrogenation 串联裂化-加氢低温裂解聚烯烃

IF 4.8 2区化学

Applied Catalysis A: General Pub Date : 2025-09-08 DOI: 10.1016/j.apcata.2025.120537

Nikolas M. Angyal , Diana García-Pérez , Raul F. Lobo

{"title":"Low temperature polyolefin deconstruction via tandem cracking-hydrogenation","authors":"Nikolas M. Angyal , Diana García-Pérez , Raul F. Lobo","doi":"10.1016/j.apcata.2025.120537","DOIUrl":"10.1016/j.apcata.2025.120537","url":null,"abstract":"<div><div>The use of aluminum chloride in dichloromethane to crack polyolefin chains in tandem with alkylation of the resulting products has been previously reported as an efficient polyolefin recycling route. Building off this work, we report that a tandem cracking-hydrogenation system also efficiently converts polyolefins into gasoline-range light alkanes at mild temperatures without needing a hydrocarbon co-reactant. This Lewis acid and hydrogenation bifunctional system uses anhydrous aluminum chloride as the acid catalyst and Pd/C as a hydrogenation catalyst to achieve nearly 80 % conversion of low-density polyethylene (LDPE) at 70 °C in three hours, with 90 + % selectivity towards gasoline-range (C<sub>4</sub>-C<sub>12</sub>) branched alkanes. By combining the endothermic cracking reaction with the exothermic hydrogenation reaction, the thermodynamic limitations to low-temperature polyolefin deconstruction can be overcome. In using hydrogenation instead of alkylation, the system’s carbon efficiency is greatly improved, the cost of the reactants is reduced and the overall mass of both reactants and products reduced as well.</div></div>","PeriodicalId":243,"journal":{"name":"Applied Catalysis A: General","volume":"708 ","pages":"Article 120537"},"PeriodicalIF":4.8,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145027130","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Probing the effects of metal loading and calcination temperature on AgOx/Al₂O₃ catalyst in ozonative epoxidation of ethylene 探讨金属负载和焙烧温度对臭氧环氧化乙烯中AgOx/Al₂O₃催化剂性能的影响

IF 4.8 2区化学

Applied Catalysis A: General Pub Date : 2025-09-04 DOI: 10.1016/j.apcata.2025.120542

Nazanin Charchi Aghdam , Ning Chen , Beatriz Diaz Moreno , Jafar Soltan

{"title":"Probing the effects of metal loading and calcination temperature on AgOx/Al₂O₃ catalyst in ozonative epoxidation of ethylene","authors":"Nazanin Charchi Aghdam , Ning Chen , Beatriz Diaz Moreno , Jafar Soltan","doi":"10.1016/j.apcata.2025.120542","DOIUrl":"10.1016/j.apcata.2025.120542","url":null,"abstract":"<div><div>This work explores the ozonative epoxidation of ethylene to produce ethylene oxide over AgO<sub>x</sub>/Al₂O₃ catalysts which is a novel reaction pathway that remains underexplored due to its recent emergence. The study focuses on the effects of silver loading and calcination temperature. Higher silver loading was found to increase the abundance of silver species on the support surface, which accelerates ozone decomposition and elevates surface oxygen coverage. This enhanced oxygen coverage, along with reduced ethylene adsorption, promotes the direct formation of ethylene oxide while maintaining high conversion rates. The catalyst with 10 wt% silver achieved an ethylene conversion of 96 % and an ethylene oxide selectivity of 68 %. Increasing the calcination temperature from 350 ºC to 750 ºC altered silver oxidation states and improved catalyst stability and ozone conversion. However, no significant enhancement in ethylene oxide selectivity was observed, likely due to limited improvement in surface oxygen coverage under those conditions. which are considered beneficial for epoxidation. Structural evolution of silver species under different atmospheres was investigated using in situ pair distribution function (PDF) analysis, revealing successive redox transformations during heating. Overall, Ag loading had a more significant impact on ethylene oxide selectivity than calcination temperature, highlighting it as a key factor in optimizing catalyst performance in ozonative epoxidation.</div></div>","PeriodicalId":243,"journal":{"name":"Applied Catalysis A: General","volume":"708 ","pages":"Article 120542"},"PeriodicalIF":4.8,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145005279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Unraveling the structure-activity relationship in bare Ga2O3 for propane dehydrogenation: The critical role of crystallite size and phase composition 揭示裸Ga2O3丙烷脱氢的构效关系：晶粒尺寸和相组成的关键作用

IF 4.8 2区化学

Applied Catalysis A: General Pub Date : 2025-09-04 DOI: 10.1016/j.apcata.2025.120541

Salman Khan , Enxi Wu , Kaijie Wang , Yi Dai , Lixia Bao , Qi Liu , Yaoyuan Zhang , Qin Wu , Daxin Shi , Kangcheng Chen , Guiyuan Jiang , Hansheng Li

{"title":"Unraveling the structure-activity relationship in bare Ga2O3 for propane dehydrogenation: The critical role of crystallite size and phase composition","authors":"Salman Khan , Enxi Wu , Kaijie Wang , Yi Dai , Lixia Bao , Qi Liu , Yaoyuan Zhang , Qin Wu , Daxin Shi , Kangcheng Chen , Guiyuan Jiang , Hansheng Li","doi":"10.1016/j.apcata.2025.120541","DOIUrl":"10.1016/j.apcata.2025.120541","url":null,"abstract":"<div><div>The non-oxidative propane dehydrogenation (PDH) has emerged as an on-purpose propene manufacture process, and attracted widespread attention. Herein, the effects of crystallite size and phase composition of Ga<sub>2</sub>O<sub>3</sub> on the catalytic performance in PDH were investigated. A series of Ga<sub>2</sub>O<sub>3</sub> catalysts with three crystalline phases (α, β, and γ) and different crystallite sizes ranging from 7 to 33 nm, were synthesized using precipitation, hydrothermal, and thermal decomposition methods. It is found that the crystallite size is closely related to the phase composition, among them, γ-Ga<sub>2</sub>O<sub>3</sub> showed the lowest crystallite size followed by β-Ga<sub>2</sub>O<sub>3</sub> and α-Ga<sub>2</sub>O<sub>3</sub>. In addition, a clear structure-activity relationship based on crystallite size, acid density, and hydroxyl group density for all different Ga<sub>2</sub>O<sub>3</sub> is established, the smaller the crystallite size, the higher the activity. Specifically, γ-Ga<sub>2</sub>O<sub>3</sub> exhibits the highest activity due to its smaller crystallite size. Moreover, the rate of propene formation for all Ga<sub>2</sub>O<sub>3</sub> is positively associated with the density of acid density and hydroxyl group, and the presence of hydroxyl groups contributes to activating the C−H bond by altering the PDH reaction from non-oxidative to oxidative pathway initially proved by in-situ PDH-MS measurements. Although the Ga<sub>2</sub>O<sub>3</sub> catalyst deactivates rapidly in propane stream due to coke formation, the initial activity can be restored after air regeneration treatment. The knowledge derived from this work can be applied to further optimize the PDH activity of Ga<sub>2</sub>O<sub>3</sub>-based catalysts and related C−H bond activation.</div></div>","PeriodicalId":243,"journal":{"name":"Applied Catalysis A: General","volume":"708 ","pages":"Article 120541"},"PeriodicalIF":4.8,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145020044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0